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POHow to disable resizing image in a imagaivew after scaling it?
 

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  1. POHow to disable resizing image in a imagaivew after scaling it?
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    <p>I'm writing a application that there are a upper-imageview and a scollview under the imageview.</p> <p>The imageview is used by a class provided by my friend, it supports pinch zoom, but after i zood in the image then i touch the scollview below, the image will resize to fit the imageview's size. </p> <p>It's a big trouble for me to build my app because i want to scroll the information after zooming.</p> <p>Then i try to change the scrollview to be a imageview as well, i find that there is not resizimg between two views.</p> <p>I wonder if it is possible to disable the resizing function for the imageview to implement my idea.</p> <p>The class below is used for the imageview.</p> <p>Thank you for solutions.</p> <pre><code>import android.content.Context; import android.graphics.Bitmap; import android.graphics.Color; import android.graphics.Matrix; import android.graphics.PointF; import android.view.MotionEvent; import android.view.ScaleGestureDetector; import android.view.View; import android.widget.ImageView; public class TouchImageView extends ImageView { Matrix matrix = new Matrix(); // We can be in one of these 3 states static final int NONE = 0; static final int DRAG = 1; static final int ZOOM = 2; int mode = NONE; // Remember some things for zooming PointF last = new PointF(); PointF start = new PointF(); float minScale = 1f; float maxScale = 3f; float[] m; float redundantXSpace, redundantYSpace; float width, height; static final int CLICK = 3; float saveScale = 1f; float right, bottom, origWidth, origHeight, bmWidth, bmHeight; int windowId; ScaleGestureDetector mScaleDetector; Context context; public TouchImageView(Context context,int id) { super(context); super.setClickable(true); this.context = context; this.windowId=id; mScaleDetector = new ScaleGestureDetector(context, new ScaleListener()); setBackgroundColor(Color.BLACK); matrix.setTranslate(1f, 1f); m = new float[9]; setImageMatrix(matrix); setScaleType(ScaleType.MATRIX); setOnTouchListener(new OnTouchListener() { public boolean onTouch(View v, MotionEvent event) { mScaleDetector.onTouchEvent(event); matrix.getValues(m); float x = m[Matrix.MTRANS_X]; float y = m[Matrix.MTRANS_Y]; PointF curr = new PointF(event.getX(), event.getY()); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: last.set(event.getX(), event.getY()); start.set(last); mode = DRAG; EasyPageActivity.resetView(); break; case MotionEvent.ACTION_MOVE: if (mode == DRAG) { float deltaX = curr.x - last.x; float deltaY = curr.y - last.y; float scaleWidth = Math.round(origWidth * saveScale); float scaleHeight = Math.round(origHeight * saveScale); if (scaleWidth &lt; width) { deltaX = 0; if (y + deltaY &gt; 0) deltaY = -y; else if (y + deltaY &lt; -bottom) deltaY = -(y + bottom); } else if (scaleHeight &lt; height) { deltaY = 0; if (x + deltaX &gt; 0) deltaX = -x; else if (x + deltaX &lt; -right) deltaX = -(x + right); } else { if (x + deltaX &gt; 0) deltaX = -x; else if (x + deltaX &lt; -right) deltaX = -(x + right); if (y + deltaY &gt; 0) deltaY = -y; else if (y + deltaY &lt; -bottom) deltaY = -(y + bottom); } matrix.postTranslate(deltaX, deltaY); last.set(curr.x, curr.y); } break; case MotionEvent.ACTION_UP: mode = NONE; int xDiff = (int) Math.abs(curr.x - start.x); int yDiff = (int) Math.abs(curr.y - start.y); if (xDiff &lt; CLICK &amp;&amp; yDiff &lt; CLICK) performClick(); if(windowId==1){ EasyPageActivity.defineId(1); } if(windowId==2){ EasyPageActivity.defineId(2); } if(windowId==3){ EasyPageActivity.defineId(3); } if(windowId==4){ EasyPageActivity.defineId(4); } if(windowId==5){ EasyPageActivity.defineId(5); } if(windowId==6){ EasyPageActivity.defineId(6); } break; case MotionEvent.ACTION_POINTER_UP: mode = NONE; break; } setImageMatrix(matrix); invalidate(); return true; // indicate event was handled } }); } @Override public void setImageBitmap(Bitmap bm) { super.setImageBitmap(bm); bmWidth = bm.getWidth(); bmHeight = bm.getHeight(); } public void setMaxZoom(float x) { maxScale = x; } private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener { @Override public boolean onScaleBegin(ScaleGestureDetector detector) { mode = ZOOM; return true; } @Override public boolean onScale(ScaleGestureDetector detector) { float mScaleFactor = (float)Math.min(Math.max(.301f, detector.getScaleFactor()), 4); float origScale = saveScale; saveScale *= mScaleFactor; if (saveScale &gt; maxScale) { saveScale = maxScale; mScaleFactor = maxScale / origScale; } else if (saveScale &lt; minScale) { saveScale = minScale; mScaleFactor = minScale / origScale; } right = width * saveScale - width - (2 * redundantXSpace * saveScale); bottom = height * saveScale - height - (2 * redundantYSpace * saveScale); if (origWidth * saveScale &lt;= width || origHeight * saveScale &lt;= height) { matrix.postScale(mScaleFactor, mScaleFactor, width / 2, height / 2); if (mScaleFactor &lt; 1) { matrix.getValues(m); float x = m[Matrix.MTRANS_X]; float y = m[Matrix.MTRANS_Y]; if (mScaleFactor &lt; 1) { if (Math.round(origWidth * saveScale) &lt; width) { if (y &lt; -bottom) matrix.postTranslate(0, -(y + bottom)); else if (y &gt; 0) matrix.postTranslate(0, -y); } else { if (x &lt; -right) matrix.postTranslate(-(x + right), 0); else if (x &gt; 0) matrix.postTranslate(-x, 0); } } } } else { matrix.postScale(mScaleFactor, mScaleFactor, detector.getFocusX(), detector.getFocusY()); matrix.getValues(m); float x = m[Matrix.MTRANS_X]; float y = m[Matrix.MTRANS_Y]; if (mScaleFactor &lt; 1) { if (x &lt; -right) matrix.postTranslate(-(x + right), 0); else if (x &gt; 0) matrix.postTranslate(-x, 0); if (y &lt; -bottom) matrix.postTranslate(0, -(y + bottom)); else if (y &gt; 0) matrix.postTranslate(0, -y); } } return true; } } @Override protected void onMeasure (int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); width = MeasureSpec.getSize(widthMeasureSpec); height = MeasureSpec.getSize(heightMeasureSpec); //Fit to screen. float scale; float scaleX = (float)width / (float)bmWidth; float scaleY = (float)height / (float)bmHeight; scale = Math.min(scaleX, scaleY); matrix.setScale(scale, scale); setImageMatrix(matrix); saveScale = 1f; // Center the image redundantYSpace = (float)height - (scale * (float)bmHeight) ; redundantXSpace = (float)width - (scale * (float)bmWidth); redundantYSpace /= (float)2; redundantXSpace /= (float)2; matrix.postTranslate(redundantXSpace, redundantYSpace); origWidth = width - 2 * redundantXSpace; origHeight = height - 2 * redundantYSpace; right = width * saveScale - width - (2 * redundantXSpace * saveScale); bottom = height * saveScale - height - (2 * redundantYSpace * saveScale); setImageMatrix(matrix); } </code></pre> <p>}</p>
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